Localytics, the leading mobile engagement platform, today announced the acquisition of Berlin-basedTapglue, an API service to drive mobile user engagement through social features. The acquisition will further fuel Localytics' operations in Europe with a new office in Berlin, which will be led by the Tapglue team. Additionally, the acquisition signals the merger of two Techstars Boston startup accelerator program graduates (Localytics in 2009, Tapglue in 2016).